Equivalent tidal quality factor as a function of stellar rotation and orbital mean motion for a solar-mass star. The white line with dark blue contour represents the limit (n = 2 Ω_c) below which tidal inertial waves propagate in the envelope. The white line with light blue contour (n = Ω_c) corresponds to corotation. Above this line, planets are migrating inward; below it, they are pushed away from the star.